PAE

PAE

Physical Address Extension. A method of allowing Intel 32bit x86 processors to
exceed the normal 4GB limit of addressable memory space, allowing access to
memory beyond 4GB. Whilst PAE allows the total available memory to extend
beyond 4GB it should be appreciated that the maximum amount of memory that
any one individual process can address remains unchanged

It is reported that on 32bit versions of Windows Vista
that PAE can be enabled by opening a command window in administrative mode
and entering:

bcdedit /set PAE forceenable

Other Windows operating systems have different ways of enabling PAE. It
should be appreciated that prior to Vista only some Windows server operating
systems supported PAE.

PAE may come with a slight performance hit. It is also reported that it
may cause problems for some device drivers. An alternative to PAE is
migrating to a true 64 bit architecture - 64 bit CPU
and 64 bit operating system.